Texas Instruments TPA2012D2 User Manual
SLOU174A – February 2005 – Revised April 2005
TPA2012D2 Audio Power Amplifier Evaluation Module
The TPA2012D2 audio power amplifier evaluation module is a complete, low-power,
Class-D, stereo audio power amplifier capable of delivering 1.2 W/channel (YZH
package). All components and the evaluation module are Pb-Free.
Contents
1 Introduction .......................................................................................... 1
2 Operation ............................................................................................ 2
3 Reference ............................................................................................ 3
4 Related Documentation From Texas Instruments .............................................. 6
List of Figures
1 TPA2012D2 Output Power ........................................................................ 2
2 Top Layer ............................................................................................ 4
3 Bottom Layer ........................................................................................ 4
4 TPA2012D2 EVM Schematic Diagram .......................................................... 5
User's Guide
1 Introduction
This section provides an overview of the Texas Instruments (TI) TPA2012D2 NanoFree™ WCSP audio
amplifier evaluation module (TPA2012D2 EVM). It includes a brief description of the module and a list of
EVM specifications.
1.1 TPA2012D2 EVM Specifications
Supply voltage range, V
Power supply current rating required 2.5 A
Continuous output power, PO: 4- Ω BTL, V
Audio input voltage, V
Minimum load impedance, Z
List of Tables
1 Gain Settings ........................................................................................ 3
2 TPA2012D2 EVM Parts List ....................................................................... 6
DD
= 5 V 1.2 W (see note)
DD
I
L
2.5 V to 5.5 V
0 V to V
DD
4 Ω
Note:
The TPA2012D2 in the RTJ package (QFN) is rated at 2.1 W/channel. The YZH package
(WCSP) is thermally limited to 1.2 W/channel on the EVM. For layouts with higher trace
density and additional copper, the maximum output power will be larger. See the data
sheet for device descriptions.
NanoFree is a trademark of Texas Instruments.
TPA2012D2 Audio Power Amplifier Evaluation ModuleSLOU174A – February 2005 – Revised April 2005 1
www.ti.com
VDD = 3.6 V, 10%
0
0.50
1
1.50
2
2.50
4 9 14 19 24 29 34
P
O
− Output Power − W
RL − Load Resistance −
See Note
VDD = 5 V, 1%
VDD = 2.5 V, 1%
VDD = 2.5 V, 10%
VDD = 3.6 V, 1%
VDD = 3.6 V, 10%
Operation
Figure 1. TPA2012D2 Output Power
Note:
The dashed portion of the curve indicates the region where the TPA2012D2YZH (WCSP)
is thermally limited. Output power in this region will depend on the heat dissipation
provided by the circuit board. TPA2012D2RTJ (QFN) is not thermally limited and can
achieve output power along both the solid and dashed portions of the curves.
2 Operation
This section describes how to operate the TPA2012D2 EVM.
2.1 Quick Start for Stand-Alone Operation
Use the following steps when operating the TPA2012D2 EVM standalone or when connecting the EVM
into existing circuits or equipment.
2.1.1 Power and Ground
1. Ensure the external power sources are set to OFF.
2. Set the power supply voltage between 2.5 V and 5.5 V. When connecting the power supply to the
EVM, make sure to attach the ground connection to the GND header pin first and then connect the
positive supply to the VDD header pin. Verify that the connections are made to the correct header pins.
2.1.2 Inputs and Outputs
2.1.2.1 Audio
1. Ensure that the audio source is set to the minimum level.
2. Connect the audio source to the inputs, INL+/- and INR+/-.
– For a differential audio source, connect the audio source directlty to the appropriate input header
– For a single-ended audio source, connect the audio source to the negative input header pin of the
3. Connect speakers (4 Ω ?32 Ω ) to the output pins, OUTL+/- and OUTR+/-.
2.1.2.2 Gain Control
1. The GAIN0 and GAIN1 jumpers control the gain setting of the TPA2012D2. With the jumpers installed,
2 SLOU174A – February 2005 – Revised April 2005TPA2012D2 Audio Power Amplifier Evaluation Module
the G0 and G1 pins are pulled to ground. See Table 1 for gain setting values.
pins.
appropriate channel and ground the positive audio input header pin.
www.ti.com
2.1.2.3 Shutdown Controls
1. The TPA2012D2 provides independent shutdown controls so that each channel can be controlled
separately. The shutdown pins, SDL and SDR, are active low. This means that a low voltage (ground)
on this pin places the appropriate channel in shutdown mode. Using the pushbuttons provided on the
EVM, the TPA2012D2 can be placed in shutdown by pressing and holding the button(s) down. Both
buttons must be depressed in order for both channels of the TPA2012D2 to turn off. When the buttons
are released, the appropriate channel on the device restarts.
2. The jumper J1 can be used to tie SDL and SDR signals together. With jumper J1 installed, both
channels can be placed in shutdown by pressing either SDL or SDR. This is the default configuration
of the EVM.
Table 1. Gain Settings
(1)
GAIN1
0 0 2 6
0 1 4 12
1 0 8 18
1 1 16 24
(1)
0 = Jumper installed, 1 = Jumper not installed
Reference
Amplifier Gain Setting (typ)
(1)
GAIN0
V/V dB
2.2 Power Up
1. Verify the correct connections as described in Sections 2.1.1 and 2.1.2.
2. Verify the voltage setting of the power supply is between 2.5 V and 5.5 V and turn ON the power
3. Adjust the audio signal source as needed.
3 Reference
This section includes the EVM schematic, parts list, and board layout reference.
supply. Proper operation of the EVM should begin.
TPA2012D2 Audio Power Amplifier Evaluation ModuleSLOU174A – February 2005 – Revised April 2005 3
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